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Mathematics, 25.09.2021 14:00 24swimdylanoh

có 2 hộp bút. mỗi hộp 10 cái, hộp 1 có 3 bút trắng và 7 bút nâu, hộp 2 có 4 bút trắng và 6 bút nâu. từ hộp 3 lấy ra 1 chiếc bút. tính xác suất bút nâu?

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có 2 hộp bút. mỗi hộp 10 cái, hộp 1 có 3 bút trắng và 7 bút nâu, hộp 2 có 4 bút trắng và 6 bút nâu....

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